Chris Hardwicke runs a wonderful wesbite called urbanism.org which is a portal to the planning and architecture world. It functions in a similar fashion to the Spacing Wire. Chris also has contributed to Spacing, most recently in the Spring/Summer 2005 issue with is futuristic proposal for elevated bike network around Toronto. Check out his site.
Also, Shin-pei Tsay, of the Project for Public Spaces, keeps a great blog called Bird to the North about NYC urban design issues. Worth checking out.
